Colin Firth and Michael Fassbender have come on board to star in Michael Grandage’s indie drama “Genius.”

John Logan wrote “Genius,” which is being produced by James Bierman for the Michael Grandage Co. Filming will start in early 2014.

FilmNation will begin international sales at AFM. CAA will arrange the financing and represent North American distribution rights.

“Genius” is based on A.Scott Berg’s biography “Max Perkins: Editor of Genius,” which centers on the real-life relationship between Thomas Wolfe (Fassbender) and Perkins (Firth).

Grandage and Bierman said in a statement: “John Logan, Colin Firth and Michael Fassbender is an extraordinary line-up to work with and we are particularly delighted to bring Glen Basner and all at FilmNation onto the team to join us as we move forward.”

Firth will be seen starring in the Eric Lomax bio-pic “The Railway Man” opposite Nicole Kidman, as well as “The Devil’s Knot” opposite Reese Witherspoon and directed by Atom Egoyan. He is represented by CAA and Independent Talent.

Fassbender will be seen in Terrence Malick’s untitled project, Ridley Scott’s “The Counselor” and Steve McQueen’s “Twelve Years a Slave.” He is represented by CAA and Troika.